Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

21. The Immune System

Introduction to the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

How do capsules enable bacteria to evade the immune system?

By enhancing the production of immune cells

By directly destroying immune cells

By producing antibodies that neutralize immune responses

By preventing phagocytosis by immune cells

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Verified step by step guidance

Understand the role of capsules in bacteria: Capsules are a protective layer that surrounds some bacterial cells, composed mainly of polysaccharides.

Recognize the function of phagocytosis: Phagocytosis is a process where immune cells, such as macrophages and neutrophils, engulf and digest foreign particles, including bacteria.

Identify how capsules interfere with phagocytosis: The capsule can prevent immune cells from recognizing and binding to the bacterial cell surface, thereby inhibiting phagocytosis.

Consider the immune evasion strategy: By preventing phagocytosis, the capsule allows bacteria to evade destruction by the immune system, enabling them to survive and potentially cause infection.

Conclude the mechanism: Capsules do not enhance immune cell production, destroy immune cells directly, or produce antibodies. Instead, they primarily prevent phagocytosis, which is a key immune evasion strategy.